application-prototype/constructors/devices/getUserMedia.js

Application builder - prototype

var promisifiedOldGUM = function(constraints, successCallback, errorCallback) {

	// First get ahold of getUserMedia, if present
	var getUserMedia = (navigator.getUserMedia ||
			navigator.webkitGetUserMedia ||
			navigator.mozGetUserMedia);

	// Some browsers just don't implement it - return a rejected promise with an error
	// to keep a consistent interface
	if(!getUserMedia) {
		return Promise.reject(new Error('getUserMedia is not implemented in this browser'));
	}

	// Otherwise, wrap the call to the old navigator.getUserMedia with a Promise
	return new Promise(function(successCallback, errorCallback) {
		getUserMedia.call(navigator, constraints, successCallback, errorCallback);
	});

};

// Older browsers might not implement mediaDevices at all, so we set an empty object first
if(typeof(navigator.mediaDevices) === "undefined") {
	navigator.mediaDevices = {};
}

// Some browsers partially implement mediaDevices. We can't just assign an object
// with getUserMedia as it would overwrite existing properties.
// Here, we will just add the getUserMedia property if it's missing.
if(typeof(navigator.mediaDevices.getUserMedia) === "undefined") {
	navigator.mediaDevices.getUserMedia = promisifiedOldGUM;
}

module.exports	= promisifiedOldGUM;